Superheater for locomotive, marine, and other boilers



n. B. DORMAN,

SUPERHEATER FOR Locomonve, MARINE, AND OTHER BOILERS.

APPLICATION FILED MAR.25, 1920'.

1,372,491 Patented Mar. 22, 1921.

2 SHEETS-SHEET l.

R. B. DORMAN. SUPERHEATER FOR LOCOMOTIVE, MARINE, AND OTHER BOILERS.

APPLICATION FILED MAR. 25, 1920- 1,372,491 Patented Mar. 22, 1921.

2 SHEETS-SHEET 2.

r Fig 2. 13 5, N {m5 5, W r /A Hill RICHARD BROOKE DORMAN, O1MIDDLESBOROUGH, ENGLAND.

SUPERHEA'IER FOR LOCOMOTIVE, MARINE. AND OTHER BOILERS.

Specification of Letters Patent.

'latented Mar. 22, 1921.

Application filed March 25, 192C. Serial No. 368,628.

To all whom it may concern:

Be it known that I, RICHARD Bnoonn DonMAN, a subject of His Majesty theKmg of England, and resident of Middlesbor ough, in the county of York,Kingdom of England, have invented certain new and useful Improvements inor Relating to Superheaters for Locomotive, Marine and other Boilers,.ofwhich the following is a specification.

This invention relates to superheaters for or slacken them for thepurpose oftaking out the superheater tubes from the boiler flue tubes.

Agcording to the present invention the improved means comprises a flangeor connecting piece provided with a recess, slot, groove or channelextending from one side of the flange or connecting piece hereinafterreferred to as flange, to the other side in a directionparallel to theface of the header to which the superheater tubes are to be secured. Thedirection of the recess, slot, groove or channel in the flange when inposition is always at right angles to the direction of the shanks of theconnecting or securing bolts. The arrangement is such that the nuts orother means used fortightening up the superheater tube joints bear onthe face of the header box opposite to the face to which thesuperheatertubes are attached. It is obvious that in this position thenuts or other tightening means are most accessible. The recess, slot,groove or channel in the flange may be of any suitable shape and is inall cases undercut to receive the head of the securingbolt. The abovedescription refers to the connection of a single superheater element orunit to its header but any number of such elements or units may beemployed all connected to the header orheaders by arecessed, slotted,grooved or channeled flange as hereinbefore described. The securingbolts are preferably T-bolts the heads of which lie in the respectiveundercut recesses, slots, grooves or channels in the flanges.

The adjacent ends of the bolt heads are arranged to buttone against theother so as to keep the bolt heads always in position to receive theflanges when placing the superheater elements or units in position inthe flue tubes, joint or packing rings being used to obtain a steamtight joint.

The header may be of any suitable design and is preferably provided witha proectmg I'll) or fin to act as a stop when placing the top row ofsuperheater elements or units in position in the boiler. The said r1b orfin extends across theheader and also acts to prevent the recesses,slots, grooves or channels in the flanges being choked by the smallashes coming through the flue tubes.

Two types of flanges may be employed, which may be described as thefixed type and the loose type, the fixed type of flange having two ormore holes to receive the corresponding tube ends. The outer end of eachhole is preferably formed as a clearing hole, the tube end beingexpanded to fit tightly against the inner part of the hole. In. theloose type of flange the holes therein to receive the tube ends areclearing holes. the tube ends being expanded to fit lightly into holesin washers or collars interposed between the flanges and the packing orjoint rings against the adjacent face of the header.

The bolt heads may be of any suitable form in cross section such ascylindrical, oval or elliptical or rectangular and are provided withmeans to prevent rotation of the bolts in the recess,slot, groove orchannel in the flange, when tightening or slackening the nuts thereon.

I will describe with reference to the ac companying drawing aconstruction in accordance with the present invention as applied to alocomotive boiler from which its general application will be readilyunderstood, but I do not limit myself to the precise constructiondescribed and illustrated. 1

Figure 1 is a vertical section of a header showing the connection of aplurality of superheater elements or units in accordance with thepresent invention.

Fig. 2 is a section on the line A, B, Fig. 1.

Fig. 3 shows a cross section of a modified form of connection also inaccordance with the present invention.

Fig. 4 is a plan of the flange shown in Fig. 3.

Figs. 5, 6, 7, 8 and 9 are detail views hereinafter described.

Referring to Figs. 1 and 2 of the drawings, 1 is the smoke box tubeplate of a locomotive boiler, 2 the main steam pipe from the regulatorvalve in the dome, and 3 is one of the flue tubes in which a superheaterelement 4 is disposed. 5 is the header-box "which may be of any suitabledesign. A

rib or fin 6 may be provided to 'act as a stop when placing the top rowof elements in position in the boiler. The rib or fin 6 which extendsacross the header box 5 also prevents the slots 7 in the flanges S "frombecoming choked by small ashes com- I ing through the fluetubes. Theflanges for securing the superheater tube ends are indicated at 8, eachflange being provided with an undercut 'slot'or channel 10. The slot orchannel 10 is engaged by a bolt head 11, the joint being tightened up bysecuring bolts 12' and nuts 13. The bolt heads 11 are providedwith faces14 which butt one against the other so as to keep the bolt heads alwaysin 'position'to receive the flanges 8 when placing the superheaterelements 4 in the flue tubes 3( Joint or packing rings 15 are used tomake a steam tight joint.

Fig. 2 shows the improved attachment with aflange 8 into which thesuperheater tube ends are expanded as at 16.

In Fig. 3 a loose flange type of connection is shown, the tube endspassing loosely through the holes 17 in the flange 8 and being expandedinto collars 18. i

The bolt heads 11 may be of difierent de sign and may be provided withprojections 20 to prevent rotation of the bolts in the flange slot 10when tightening or slacking back the nuts.

In Figs. 1, 2 and 9 the bolt heads 11 are shown as. of cylindrical crosssection and elliptical longitudinal section or the ends of the bolts maybe rounded off as shown, the boltsbeing circular in cross section withor without flattened sides as shown at 21. In Figs. 4, 5 and 6 the boltheads are shown as being of approximately elliptical cross section andcircular in plan, the bolt near the junction with the head being of ovalsection as at 22 with or without flattened side parts"23, 24.

The improved attachment hereinbefore described'may be used with anydesign of header and in view of the accessibility of the securing nutsis most suitable for the attachment of marine lire tube superheaterelements to the header boxes.

The devicemay also be applied to almost any form of tube joints withadvantage.

l Vhat I claim as my invention is 1. In a device of the class described.the combination of a header. a tubular superheater element and meanssecuring the ends of the elements to the heade comprising a flange orconnecting piece, provided with an undercut slot,'and a bolt. the headof: which lies in the slot, the longitudinal dimension of the slot inthe flange when in position being always at right angles to the axis ofthe shank of the connecting bolt.

2. In a device of the class described. the combination of a headerprovided with 1: opening extending through it, a tubular superheaterelement, and means securing the ends of the element to the headercomprising a flange or connecting piece provided with an undercut slot,the longitudinal dimension of the slot in the flange when in positionbeing always at right angles to the axis of the shank of the connectingbolt, a bolt, the head of which lies in the slot and which extendsthrough the opening in the header and a nut engaging the end of thebolt.

3. In a device of the class described, the combination of a headerprovided with an opening extending between two of its faces. a tubularsuperheater element. and means securing the ends of the element to oneof the said faces of the header comprising a flange or connecting pieceprovided with an undercut slot, a bolt the head of which lies in theslot and which extends through the opening of the header, thelongitudinal dimension of the slot in said flange when in position beingalways at right angles to the axis of the shank of the connecting bolt.and a nut engaging the end of the bolt, and exerting pressure againstthe adjacent face and drawing the flange toward the opposite face of theheadei', the engaging faces of the head and undercut slot permitting a.slight relative rocking movement.

4. In a device of the class described, the combination of a. pluralityof alined flanges each provided with an undercut slot in one face. theslots all being in alinement. two openings extending through each flangeon opposite sides of the slot, :1 superheater element end entering eachopening from the side opposite the slot. a header adjacent to theslotted sides of the flanges with an opening through it opposite theslots. bolts extending through said last named opening, the head of onebolt lying in each slot, the longitudinal dimension of the slots in theflanges when in position being always at right angles to the axis of theshanks of the connecting bolts. and a nut on the opposite end of eachbolt exerting pressure against the header, thereby drawing the flangetoward the header.

5. In a device of the class described, the combination of a plurality ofalined flanges eachprovided with an undercut slot in one Face, the slotsall being in alinernent, two openings extending through each flange onopposite sides of the slot, a superheater element end associated witheach opening, entering it from the side oppositethe slot, a headeradjacent to the slotted sides of the flanges with an opening through. itopposite the flanges, a plurality of alined bolts extending through saidlast named opening, each slot having in it the head of one bolt,adjacent heads abutting against each other, the longitudinal dimensionof the slots in the flanges when in position being always posite end ofeach bolt exerting pressure against the header, whereby when the nutsare drawn up the flanges are drawn toward the header and when the nutsare loosened up the flanges may be slipped off or on the heads, the boltheads retaining each other in alinement.

In testimony whereof I have hereunto signed my name.

RICHARD BROOKE DORMAN.

